DS1553WP-120+

Real Time Clock Overview

The DS1553WP-120+ is a Year-2000-compliant real-time clock/calendar integrated with 64KB nonvolatile static RAM. Operating at 3.3V, it utilizes a byte-wide parallel interface and resides in a 34-pin PowerCap module package. The device maintains timekeeping data using an internal lithium energy source that activates upon power application. It features double-buffered RTC registers for accurate data access, programmable alarm and watchdog timers, and automatic leap year compensation valid through the year 2100.

Real Time Clock Feature Summary

• Integrated 64KB NV SRAM with RTC registers mapped to the top 16 memory locations
• Year-2000 compliant with automatic leap year correction up to 2100
• Programmable watchdog timer and RTC alarm with interrupt output
• Precision power-on reset and battery voltage level indicator flag

Real Time Clock Applications

• Industrial systems requiring precise timekeeping and data retention
• Embedded controllers needing integrated nonvolatile memory and clock functions
• Battery-backed backup systems utilizing external PowerCap modules

Real Time Clock Procurement Notes

Verify the inclusion of the separate DS9034PCX PowerCap module, which contains the required crystal and lithium battery. Confirm the specific voltage rating (3.3V) and temperature range (0°C to +70°C) match system requirements. Ensure the ordering suffix corresponds to the lead-free RoHS-compliant version.

Real Time Clock Selection Notes

Select this component when a combined RTC and substantial nonvolatile storage solution is needed. The 34-pin PowerCap configuration allows surface-mount assembly of the silicon base before attaching the battery module, protecting sensitive components from reflow heat. Verify compatibility with the external PowerCap part number DS9034PCX.

Real Time Clock Part Context

This part belongs to the DS1553 family of timekeeping RAM devices. Variants exist for 5.0V operation and different package types, including a 28-pin EDIP module. The WP suffix indicates the 3.3V PowerCap variant, distinguishing it from the standard DIP or 5V versions within the same functional family.

Real Time Clock Replacement Considerations

Direct replacements include other DS1553 variants such as DS1553P-120+ for 3.3V PowerCap applications or DS1553W-120+ for 28-pin DIP configurations. Ensure the replacement matches the required supply voltage and package form factor.